drivers/mfd/max77693.c

   1 /*
   2  * max77693.c - mfd core driver for the MAX 77693
   3  *
   4  * Copyright (C) 2012 Samsung Electronics
   5  * SangYoung Son <hello.son@smasung.com>
   6  *
   7  * This program is not provided / owned by Maxim Integrated Products.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  * This driver is based on max8997.c
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/i2c.h>
  29 #include <linux/err.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/of.h>
  32 #include <linux/pm_runtime.h>
  33 #include <linux/mutex.h>
  34 #include <linux/mfd/core.h>
  35 #include <linux/mfd/max77693.h>
  36 #include <linux/mfd/max77693-private.h>
  37 #include <linux/regulator/machine.h>
  38 #include <linux/regmap.h>
  39
  40 #define I2C_ADDR_PMIC   (0xCC >> 1)     /* Charger, Flash LED */
  41 #define I2C_ADDR_MUIC   (0x4A >> 1)
  42 #define I2C_ADDR_HAPTIC (0x90 >> 1)
  43
  44 static struct mfd_cell max77693_devs[] = {
  45         { .name = "max77693-pmic", },
  46         { .name = "max77693-charger", },
  47         { .name = "max77693-flash", },
  48         { .name = "max77693-muic", },
  49         { .name = "max77693-haptic", },
  50 };
  51
  52 int max77693_read_reg(struct regmap *map, u8 reg, u8 *dest)
  53 {
  54         unsigned int val;
  55         int ret;
  56
  57         ret = regmap_read(map, reg, &val);
  58         *dest = val;
  59
  60         return ret;
  61 }
  62 EXPORT_SYMBOL_GPL(max77693_read_reg);
  63
  64 int max77693_bulk_read(struct regmap *map, u8 reg, int count, u8 *buf)
  65 {
  66         int ret;
  67
  68         ret = regmap_bulk_read(map, reg, buf, count);
  69
  70         return ret;
  71 }
  72 EXPORT_SYMBOL_GPL(max77693_bulk_read);
  73
  74 int max77693_write_reg(struct regmap *map, u8 reg, u8 value)
  75 {
  76         int ret;
  77
  78         ret = regmap_write(map, reg, value);
  79
  80         return ret;
  81 }
  82 EXPORT_SYMBOL_GPL(max77693_write_reg);
  83
  84 int max77693_bulk_write(struct regmap *map, u8 reg, int count, u8 *buf)
  85 {
  86         int ret;
  87
  88         ret = regmap_bulk_write(map, reg, buf, count);
  89
  90         return ret;
  91 }
  92 EXPORT_SYMBOL_GPL(max77693_bulk_write);
  93
  94 int max77693_update_reg(struct regmap *map, u8 reg, u8 val, u8 mask)
  95 {
  96         int ret;
  97
  98         ret = regmap_update_bits(map, reg, mask, val);
  99
 100         return ret;
 101 }
 102 EXPORT_SYMBOL_GPL(max77693_update_reg);
 103
 104 static const struct regmap_config max77693_regmap_config = {
 105         .reg_bits = 8,
 106         .val_bits = 8,
 107         .max_register = MAX77693_PMIC_REG_END,
 108 };
 109
 110 static int max77693_i2c_probe(struct i2c_client *i2c,
 111                               const struct i2c_device_id *id)
 112 {
 113         struct max77693_dev *max77693;
 114         u8 reg_data;
 115         int ret = 0;
 116
 117         max77693 = devm_kzalloc(&i2c->dev,
 118                         sizeof(struct max77693_dev), GFP_KERNEL);
 119         if (max77693 == NULL)
 120                 return -ENOMEM;
 121
 122         i2c_set_clientdata(i2c, max77693);
 123         max77693->dev = &i2c->dev;
 124         max77693->i2c = i2c;
 125         max77693->irq = i2c->irq;
 126         max77693->type = id->driver_data;
 127
 128         max77693->regmap = devm_regmap_init_i2c(i2c, &max77693_regmap_config);
 129         if (IS_ERR(max77693->regmap)) {
 130                 ret = PTR_ERR(max77693->regmap);
 131                 dev_err(max77693->dev, "failed to allocate register map: %d\n",
 132                                 ret);
 133                 return ret;
 134         }
 135
 136         ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_PMIC_ID2,
 137                                 &reg_data);
 138         if (ret < 0) {
 139                 dev_err(max77693->dev, "device not found on this channel\n");
 140                 return ret;
 141         } else
 142                 dev_info(max77693->dev, "device ID: 0x%x\n", reg_data);
 143
 144         max77693->muic = i2c_new_dummy(i2c->adapter, I2C_ADDR_MUIC);
 145         i2c_set_clientdata(max77693->muic, max77693);
 146
 147         max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
 148         i2c_set_clientdata(max77693->haptic, max77693);
 149
 150         /*
 151          * Initialize register map for MUIC device because use regmap-muic
 152          * instance of MUIC device when irq of max77693 is initialized
 153          * before call max77693-muic probe() function.
 154          */
 155         max77693->regmap_muic = devm_regmap_init_i2c(max77693->muic,
 156                                          &max77693_regmap_config);
 157         if (IS_ERR(max77693->regmap_muic)) {
 158                 ret = PTR_ERR(max77693->regmap_muic);
 159                 dev_err(max77693->dev,
 160                         "failed to allocate register map: %d\n", ret);
 161                 goto err_regmap_muic;
 162         }
 163
 164         ret = max77693_irq_init(max77693);
 165         if (ret < 0)
 166                 goto err_irq;
 167
 168         pm_runtime_set_active(max77693->dev);
 169
 170         ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
 171                               ARRAY_SIZE(max77693_devs), NULL, 0, NULL);
 172         if (ret < 0)
 173                 goto err_mfd;
 174
 175         return ret;
 176
 177 err_mfd:
 178         max77693_irq_exit(max77693);
 179 err_irq:
 180 err_regmap_muic:
 181         i2c_unregister_device(max77693->muic);
 182         i2c_unregister_device(max77693->haptic);
 183         return ret;
 184 }
 185
 186 static int max77693_i2c_remove(struct i2c_client *i2c)
 187 {
 188         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 189
 190         mfd_remove_devices(max77693->dev);
 191         max77693_irq_exit(max77693);
 192         i2c_unregister_device(max77693->muic);
 193         i2c_unregister_device(max77693->haptic);
 194
 195         return 0;
 196 }
 197
 198 static const struct i2c_device_id max77693_i2c_id[] = {
 199         { "max77693", TYPE_MAX77693 },
 200         { }
 201 };
 202 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 203
 204 static int max77693_suspend(struct device *dev)
 205 {
 206         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 207         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 208
 209         if (device_may_wakeup(dev))
 210                 irq_set_irq_wake(max77693->irq, 1);
 211         return 0;
 212 }
 213
 214 static int max77693_resume(struct device *dev)
 215 {
 216         struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
 217         struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
 218
 219         if (device_may_wakeup(dev))
 220                 irq_set_irq_wake(max77693->irq, 0);
 221         return max77693_irq_resume(max77693);
 222 }
 223
 224 static const struct dev_pm_ops max77693_pm = {
 225         .suspend = max77693_suspend,
 226         .resume = max77693_resume,
 227 };
 228
 229 #ifdef CONFIG_OF
 230 static struct of_device_id max77693_dt_match[] = {
 231         { .compatible = "maxim,max77693" },
 232         {},
 233 };
 234 #endif
 235
 236 static struct i2c_driver max77693_i2c_driver = {
 237         .driver = {
 238                    .name = "max77693",
 239                    .owner = THIS_MODULE,
 240                    .pm = &max77693_pm,
 241                    .of_match_table = of_match_ptr(max77693_dt_match),
 242         },
 243         .probe = max77693_i2c_probe,
 244         .remove = max77693_i2c_remove,
 245         .id_table = max77693_i2c_id,
 246 };
 247
 248 static int __init max77693_i2c_init(void)
 249 {
 250         return i2c_add_driver(&max77693_i2c_driver);
 251 }
 252 /* init early so consumer devices can complete system boot */
 253 subsys_initcall(max77693_i2c_init);
 254
 255 static void __exit max77693_i2c_exit(void)
 256 {
 257         i2c_del_driver(&max77693_i2c_driver);
 258 }
 259 module_exit(max77693_i2c_exit);
 260
 261 MODULE_DESCRIPTION("MAXIM 77693 multi-function core driver");
 262 MODULE_AUTHOR("SangYoung, Son <hello.son@samsung.com>");
 263 MODULE_LICENSE("GPL");